David matthew



' To ALL. wHoM I'rIuYKcoNoERN:

@ritten tensgsttnt lf'irt.

DAVID MATTHEW, ory PRAIRIE DU GHIFJN, WISCONSIN i Letters Patent No.64,992, dated May 21, 1867.

'IMPROVEMENT INSTRUMENTS FOR PREVENTING INGRUSTATION 0FlSIIE'M130,IL`BRS.

ilifgtSdgIbnle rrftrtrii in iitbese Enters ntnit mit milling pmt at tu:samt l Be it'known Athat I, "DAV1D MATTHEW, 'f Prairie Du Chien, in thecounty of Crawford, in the Stute' ci' Wisconsin, have invented a, newMethod or Means of Cleaning Steain Boilers; and I do hereby declare-thatthe.l I 'following is a full and enactdcscription thereo'r'cfcrencebeing had to the accompanying drawings., making part .of thisapplication#V My invention relates to a method. ormeans of cleaning,thatfis, removing the scale from'stemn boilers.

' have discovered that if a mossel metallic pieces, copper and zinc,(o1` zinc only, if the boiler tubes be of copper) lbe placed together inthe Ivaterjof asteaiu boiler and the water heated to make steam.' anaction will tnkc'plnce panyi-ng drawings, the modeoicarrying it outwhich I have successfully practised.

Y with inany holes, and provided at each end with a screw-cap,

' if there are others possessing the same chemical proporties; butwhnt'I claim as I n by which all scalo willbe eiectually removed from'the surfaces of the interior of.the boiler; and to enable those skilledto understand und work niy invention, I will describe more fully,referring byietters to the accom- VIn the drawings,.Figure 1 is anillustratie' in elevation of an ordinary tubular'boilerf-B, 'showingaportion brolren mvayt At A is shown tho cage ncontaining the metallicscraps, which is more 'clearly shown on an enlarged sc ale at Figure 2.This cage, as shown atiig. 2, I have made of a piece ot' iron tubing, A,perforated D, also porioratsiLandA iilled'yvith ,small pieces or scrapsof :copper and zinc, as clearly-seen at E,l.where,the tube is shownbroken away to display the filling, and.Y

iv-li'ere the pieces tinted in red represent the copper scrap, and thoseltinted in blue the zinc scrap.

I have shown and described the simple and effective form or constructionof apparatus which I have made and used with much success, but of coursethe inode of construction may be varied from that shown withoutdeparting from my invention, contain the scrap or pieces of suitablltothe desired effect, viz, the complete and rapid nemovu itonlybeingessential to the latter that there be soine sort of cago or .case toexperience that where the tubes of the boiler are made of copper, thevcopper scrap may be omitted from fthe page A, end onlyl pieces of zincuse d therein.

I am aware that potash,V scaling powders, and other substances, havebeen usodto remove scalo from steam boilers. I am also 4aware that thoscaloA has been recieved by'tho employment of an elastic wire, bnt,'I donot desire to have my invention ordiscovery confounded with any'suohmeans of cleansing boilers. As I have oxplained,-my invention consistsin the arrangement'of a quantity or mass tif pieces of metal suitablyconfined Qrheld, 'so that when submerged an action arises effecting theremoval of the scalo from the boiler, as I have stated, I

I need not allude particularly to the advantages of my invention for nready and rapid means of economically removing the scole'from steamboilers, ns it is universally acknowledged to be a great desideratuux.

I have `thoroughly tested the eiciency of my new means of cleaning steamboilers,

all known methods.

I Ilo notI wish to bc understood a s limiting my invention to theprecise ingredients (materials) mentioned,

boilers, is- A The employment witlIi dure by Letters Patent, as a meansof preventing incrustation of, and the removal of scale from, 'steam ntho boiler of a cage or case containing metallicgsorap, substantially asdescribed.

' -DAVID MATTHEW. [1.. s.}

Witnesses:

Nrcnonss Sami, TrzoMAsB. MA'mxsw.

and nd it to surpass u y invention, and desire to,

